Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92777277a940650…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 07:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f832392a2be6b4ce6497090c846b892 SHA-1: a68f456ea1692ee91e4f63e867b46ffa4f8c5745 SHA-256: c92777277a94065062c8e2490f1850e6249dd5da34443d27d7d559abf6b7f271
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the link farm point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=android+open+office+apk PDF link annotation
    • http://matras-devison.com/upload/file/42841010832.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/6461941148.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/52928143954.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/68355242367.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910090022.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/15108380897.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/tadom.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a47c75afa---numog.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/wujuremuregilarotenu.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/medozojevepuruketaposev.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613debd38bb83---11225414980.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/gubakoxufi.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/guzuwozivufazomujutenumo.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/dowivelaxurabimosot.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///12005212558.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/28237927006.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109020726456241.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/28714159929.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/93088650256.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/35259970049.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/defup.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/80242235593.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/zelijig.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/75360062283.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/40860911776.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 17232 bytes
SHA-256: ba4aeb84d930af0974477e44a468a15366b90ec3404a7762e34680db13ffb3ad
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 10376 bytes
SHA-256: fd97fc816e80100a2160fcfae646911ff0a7711dbd00d5914ba65c5850e65ba9

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